Launch

Spacecraft

Power provided by a single Sun-tracking solar array and two 50 Ampere-Hour (AHr), Nickel Cadmium (NiCd) batteries

Attitude control provided through four reaction wheels (pitch, yaw, roll, and skew); three 2-channel gyros with celestial drift updating; a static Earth sensor; a 1750 processor; and torque rods and magnetometers for momentum uploading

Orbit control and backup momentum unloading provided through a blow-down monopropellant hydrazine system with a single tank containing 270 pounds of hydrazine, associated plumbing, and twelve 1-pound-thrust jets

Weight: approx. 4,800 lbs (2,200 kg)

Length: 4.3 m (14 ft)

Diameter: 2.8 m (9 ft)

Communications

Direct Downlink with Solid State Recorders (SSR)

Data rate: 150 Mbps

Orbit

Worldwide Reference System-2 (WRS-2) path/row system

Sun-synchronous orbit at an altitude of 705 km (438 mi)

233 orbit cycle; covers the entire globe every 16 days (except for the highest polar latitudes)

Inclined 98.2° (slightly retrograde)

Circles the Earth every 98.9 minutes

Equatorial crossing time: 10:00 a.m. +/- 15 minutes

Sensors

Enhanced Thematic Mapper Plus (ETM+)

Eight spectral bands, including a pan and thermal band:

Band 1 Visible (0.45 - 0.52 µm) 30 m

Band 2 Visible (0.52 - 0.60 µm) 30 m

Band 3 Visible (0.63 - 0.69 µm) 30 m

Band 4 Near-Infrared (0.77 - 0.90 µm) 30 m

Band 5 Near-Infrared (1.55 - 1.75 µm) 30 m

Band 6 Thermal (10.40 - 12.50 µm) 60 m Low Gain / High Gain

Band 7 Mid-Infrared (2.08 - 2.35 µm) 30 m

Band 8 Panchromatic (PAN) (0.52 - 0.90 µm) 15 m

Ground Sampling Interval (pixel size): 30 m reflective, 60 m thermal

Added the Band 6 Low and High gain 60 m thermal bands

On-board calibration was added to Landsat 7: a Full Aperture Solar Calibrator (FASC) and a Partial Aperture Solar Calibrator (PASC), in addition to the 2 calibration lamps

Other Characteristics

Scene size: 170 km x 185 km (106 mi x 115 mi)

Design Life: Minimum of 5 years

Figure 3. Landsat 7

About

Landsat represents the world's longest continuously acquired collection of space-based moderate-resolution land remote sensing data. Four decades of imagery provides a unique resource for those who work in agriculture, geology, forestry, regional planning, education, mapping, and global change research. Landsat images are also invaluable for emergency response and disaster relief.

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